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https://github.com/xen-project/xen.git
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Andrew Cooper
0853659695
Checkpointed streams need to signal the end of a consistent view of VM state, and the start of the libxl data. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com> CC: Ian Campbell <Ian.Campbell@citrix.com> CC: Ian Jackson <Ian.Jackson@eu.citrix.com> CC: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Campbell <Ian.Campbell@citrix.com>
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
#include <assert.h>
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#include "xc_sr_common.h"
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static const char *dhdr_types[] =
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{
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[DHDR_TYPE_X86_PV] = "x86 PV",
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[DHDR_TYPE_X86_HVM] = "x86 HVM",
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[DHDR_TYPE_X86_PVH] = "x86 PVH",
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[DHDR_TYPE_ARM] = "ARM",
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};
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const char *dhdr_type_to_str(uint32_t type)
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{
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if ( type < ARRAY_SIZE(dhdr_types) && dhdr_types[type] )
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return dhdr_types[type];
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return "Reserved";
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}
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static const char *mandatory_rec_types[] =
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{
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[REC_TYPE_END] = "End",
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[REC_TYPE_PAGE_DATA] = "Page data",
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[REC_TYPE_X86_PV_INFO] = "x86 PV info",
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[REC_TYPE_X86_PV_P2M_FRAMES] = "x86 PV P2M frames",
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[REC_TYPE_X86_PV_VCPU_BASIC] = "x86 PV vcpu basic",
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[REC_TYPE_X86_PV_VCPU_EXTENDED] = "x86 PV vcpu extended",
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[REC_TYPE_X86_PV_VCPU_XSAVE] = "x86 PV vcpu xsave",
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[REC_TYPE_SHARED_INFO] = "Shared info",
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[REC_TYPE_TSC_INFO] = "TSC info",
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[REC_TYPE_HVM_CONTEXT] = "HVM context",
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[REC_TYPE_HVM_PARAMS] = "HVM params",
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[REC_TYPE_TOOLSTACK] = "Toolstack",
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[REC_TYPE_X86_PV_VCPU_MSRS] = "x86 PV vcpu msrs",
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[REC_TYPE_VERIFY] = "Verify",
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[REC_TYPE_CHECKPOINT] = "Checkpoint",
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};
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const char *rec_type_to_str(uint32_t type)
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{
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if ( !(type & REC_TYPE_OPTIONAL) )
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{
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if ( (type < ARRAY_SIZE(mandatory_rec_types)) &&
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(mandatory_rec_types[type]) )
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return mandatory_rec_types[type];
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}
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return "Reserved";
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}
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int write_split_record(struct xc_sr_context *ctx, struct xc_sr_record *rec,
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void *buf, size_t sz)
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{
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static const char zeroes[(1u << REC_ALIGN_ORDER) - 1] = { 0 };
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xc_interface *xch = ctx->xch;
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typeof(rec->length) combined_length = rec->length + sz;
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size_t record_length = ROUNDUP(combined_length, REC_ALIGN_ORDER);
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struct iovec parts[] =
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{
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{ &rec->type, sizeof(rec->type) },
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{ &combined_length, sizeof(combined_length) },
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{ rec->data, rec->length },
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{ buf, sz },
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{ (void*)zeroes, record_length - combined_length },
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};
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if ( record_length > REC_LENGTH_MAX )
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{
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ERROR("Record (0x%08x, %s) length %#x exceeds max (%#x)", rec->type,
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rec_type_to_str(rec->type), rec->length, REC_LENGTH_MAX);
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return -1;
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}
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if ( rec->length )
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assert(rec->data);
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if ( sz )
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assert(buf);
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if ( writev_exact(ctx->fd, parts, ARRAY_SIZE(parts)) )
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goto err;
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return 0;
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err:
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PERROR("Unable to write record to stream");
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return -1;
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}
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static void __attribute__((unused)) build_assertions(void)
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{
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XC_BUILD_BUG_ON(sizeof(struct xc_sr_ihdr) != 24);
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XC_BUILD_BUG_ON(sizeof(struct xc_sr_dhdr) != 16);
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XC_BUILD_BUG_ON(sizeof(struct xc_sr_rhdr) != 8);
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XC_BUILD_BUG_ON(sizeof(struct xc_sr_rec_page_data_header) != 8);
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XC_BUILD_BUG_ON(sizeof(struct xc_sr_rec_x86_pv_info) != 8);
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XC_BUILD_BUG_ON(sizeof(struct xc_sr_rec_x86_pv_p2m_frames) != 8);
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XC_BUILD_BUG_ON(sizeof(struct xc_sr_rec_x86_pv_vcpu_hdr) != 8);
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XC_BUILD_BUG_ON(sizeof(struct xc_sr_rec_tsc_info) != 24);
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XC_BUILD_BUG_ON(sizeof(struct xc_sr_rec_hvm_params_entry) != 16);
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XC_BUILD_BUG_ON(sizeof(struct xc_sr_rec_hvm_params) != 8);
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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